590 Forestry Quarterly, 



found. This type is especially well developed on old beaches 

 where the dry season is wanting. In the Davao Gulf, for in- 

 stance, are encountered heavy stands of very large trees of haga- 

 chac, guijo, and bagtican lauan that will scale as high as 100,000 

 board feet to the acre. It must be remembered that in such 

 places the ground water level is not far below the surface, and 

 the atmospheric moisture conditions are constantly humid. The 

 humus accumulations of previous generations of vegetation 

 eiriches the well-drained soil. Altogether, these conditions make 

 the habitat an exceedingly favorable one. 



Pine Type. 



This type reaches its best development in the high plateau re- 

 gion of northern and central Luzon. The greater part of it, al- 

 though at an altitude ranging from 900 to 1,500 meters (2950 to 

 3280 feet), is in a region with a distinct dry season. The rain- 

 bearing winds of the dry season deposit most of their moisture 

 before they reach this rough plateau region. The pines are scat- 

 tered as single individuals, or in open to nearly closed patches 

 throughout a large grass area. In many ravines and along water 

 courses are stands of broad-leaved trees. There is much evidence 

 to show that formerly this area was covered with forest growth 

 consisting principally of broad-leaved trees, and although pines 

 were undoubtedly present, they were of little relative importance, 

 being confined to the steeper and drier situations where the broad- 

 leaved trees could not grow. Through the activities of man, 

 however, in the centuries of occupation, the broad-leaved trees 

 have been cleared off, and repeated fires have prevented their re- 

 production. The pine, however, is less sensitive to fires, and con- 

 sequently at present there are broad areas of grass lands with 

 many groves of pines. There is little doubt that if fires were 

 kept off, the pine, in the absence of broad-leaved competition, 

 would quickly seed up the entire area, for its reproduction is 

 abundant and rapid ; and gradually the pines themselves would 

 be replaced by the original broad-leaved vegetation. This strug- 

 gle between the pines and the groad-leaved trees is often shown 

 in caingins bordering situations where both types occur. The 



